Dispenser for a roll of pressure-sensitive adhesive coated abrasive discs

ABSTRACT

A dispenser suitable for individually dispensing the abrasive discs from a convolutely wound roll of pressure-sensitive adhesive coated abrasive discs. The dispenser comprises a support for the roll of discs, a standard supporting a severing edge substantially narrower than the diameter of the discs to be dispensed and registering means for insuring that adjacent discs are separated at their line of tangency to form abrasive discs.

United States Patent Steinhauser et al.

Oct. 14, 1975 DISPENSER FOR A ROLL OF PRESSURE-SENSITIVE ADHESIVE COATEDABRASIVE DISCS Inventors: Armin H. Steinhauser, St. Paul;

Eugene L. Baratto, Township of White Bear, County of Ramsey, both ofMinn.

Assignee: Minnesota Mining and Manufacturing Company, St. Paul, Minn.

Filed: May 16, 1974 Appl. No.: 470,526

Related U.S. Application Data Division of Ser. No. 295,842, Oct. 10,1972, Pat. No. 3,849,949.

U.S. Cl. 225/52; 225/25; 225/38;

225/47 Int. Cl. B26F 3/02 Field of Search 225/37, 38, 39, 51, 52,

[56] References Cited UNITEDSTATES PATENTS 384,877 6/1888 St. John225/54 X 751,2l4 2/1904 Steeb 225/47 2,4l6,l l5 2/1947 Neuman 225/47Primary Examiner-Robert L. Spruill Assistant Examinerbeon GildenAttorney, Agent, or FirtnAlexander, Sell, Steldt & DeLaHunt [57]ABSTRACT A dispenser suitable for individually dispensing the abrasivediscs from a convolutely wound roll of pressure-sensitive adhesivecoated abrasive discs. The dispenser comprises a support for the roll ofdiscs, a standard supporting a severing edge substantially narrower thanthe diameter of the discs to be dispensed and registering means forinsuring that adjacent discs are separated at their line of tangency toform abrasive discs.

2 Claims, 4 Drawing Figures U.S. Patent ct.14,1975 3,912,142

DISPENSER FOR A ROLL OF PRESSURE-SENSITIVE ADHESIVE COATED ABRASIVEDISCS This is a division of application Ser. No. 295,842 filed Oct. 10,1972 now US. Pat. No. 3,849,949.

BACKGROUND OF THE INVENTION This invention relates to abrasive discshaving a coating of-pressure-sensitive adhesive on the back thereof and,in one aspect, to a dispenser for dispensingpressure-sensitive adhesivediscs from a continuous roll of discs.

The prior art discloses a strip or ribbon comprising a first strip inthe form of a chain of abrasive discs having a pressure-sensitiveadhesive thereon and a second strip of flexible material covering theadhesive and being releasably adhesively bonded to the first strip. Theresulting laminate is convolutely wound to form a roll which can beseparated into individual laminated abrasive discs. Additionally, theprior art shows a dispensing device suitable for individually dispensingthe abrasive discs and for retaining the release liner separated fromsaid disc, see US. Pat. No. 3,267,623. Such a roll of discs and thedispensing means, while allowing the user to obtain a plurality of discsin a continuous roll, requires the additional expense of having aflexible covering to protect the adhesive coating and the additionaltrouble associated with separating the covering from the adhesivebacking on the coated abrasive discs. Also, while such discs can bedispensed with the disclosed dispenser, the dispensing means does nothave means for registering each disc with relationship to the cuttingbar to insure that individual discs are severed from the roll.

BRIEF SUMMARY OF THE INVENTION It has been found that a roll ofpressure-sensitive coated abrasive disc segments can be formed withoutthe use of a flexible liner for protection of the disc or adhesive, anddiscs from such a roll can be indexed and dispensed individually withoutthe trouble of having to sever and remove a layer of release liner. Theabrasive roll of this invention comprises a concatenation ofpressure-sensitive adhesive-coated abrasive discs connected with atleast one other disc at a line of tangency, the concatenation of discsbeing convolutely wound to form a roll which can be easily unrolled. Adispensing device which has a severing edge substantially narrower thanthe greater width of the discs and having on each end of said severingedge a registering member will insure that individual discs areseparated from the concatenation of discs at the line of tangencybetween adjoining discs. The dispenser allows the easy and quickdispensing of the abrasive discs from the roll in the form of individualpressure-sensitive coated discs without the delay and mess caused by aprotective liner.

BRIEF DESCRIPTION OF THE DRAWING A further understanding may be had byreference to the accompanying drawing in which:

FIG. 1 is a perspective view of a roll of abrasive disc segments mountedin the dispensing device of this invention;

FIG. 2 is an elevational view in partial section of the device of FIG.1',

FIG. 3 is a vertical sectional view taken along the line 33 of FIG. 2;and

FIG. 4 is a plan view of a portion of a concatenate of abrasive discsforming a roll in accordance with this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the accompanyingdrawing in which like reference numerals refer to like parts, aconvolutely wound roll of abrasive discs 10 is rotatably mounted upon asupporting shaft 12 within a dispensing unit 13. A core 14 about whichthe roll of discs have been convolutely wound is retained on the shaft12 by a wall 15 within the dispenser l3 and by friction retaining meansin the form of a spring-loaded ball 16. The supporting shaft 12 ismounted within the case 18 and extends either direction from the wall15, there being sufficient space in the case as shown to mount two rollsof convolutelyvwound abrasive discs thereby allowing more than one gradeor type of abrasive disc to be available in the dispensersimultaneously. It is possible to form dispensing units having only oneor more than two rolls of convolutely wound abrasive discs, the exactnumber of rolls in a dispenser depending on the number of grades andtypes of abrasive disc needed in each dispenser.

For ease of carrying a handle 20 is mounted on top of the three-sidedframe of the dispensing device making movement from place-to-placewithin a working area very convenient. A standard 23 projects from theframe in spaced relationship to the shaft 12 to allow a roll of discs tobe easily placed on the shaft. The standard 23 supports a knife, forminga cutting edge 24, at its free edge and has a projection 26 placed oneach end of the cutting edge 24 which project above said edge to definedisc registering means which index the individual discs in the roll. Asmooth surfaced retention member 22 is mounted on the standard 23between the cutting edge 24 and the roll of abrasive discs 10 to retainthe disc on the end of the roll in a position to be easily reached. Thesuccessive discs 25 will remain in contact with the retention member 22because of the pressure-sensitive adhesive disposed on the abrasive discopposite the surface having abrasive granules disposed thereon. When itis desired to separate a disc from the roll of discs, the disc desiredto be separated is brought forward over the projecting registering meansand then down toward the cutting edge 24. The projections 26 willprevent an abrasive disc from being separated from the adjoining discuntil the width of the disc between the projections 26 is equal to orless than the width of the cutting edge 24 exposed by the projections.By properly regulating the registering means 26, it is possible to forma spacing which insures that adjoining discs are separated only at theline of tangency where the adjacent discs meet. The cutting edge 24 isshown held in place by screws 21 which allow the removal of a worncutting blade and its replacement with a new blade. The cutting edge maybe permanently or removeably mounted using a variety of fastening means,e.g., metal screws, nut and bolt, rivet, etc.

FIG. 2 shows a sectional view of the roll of pressuresensitive coatedabrasive discs 10 mounted on the supporting shaft 12. The roll 10 isheld in place by the retaining means. When all of the abrasive discshave been dispensed, it is a simple matter to force the core 14 over theball 16 and slide the core 14 off of the shaft,

and insert a new roll of adhesively coated abrasive discs on the shaft12.

In FIG. 3 an abrasive disc 30 is shown resting on the smooth retainingmember 22 which supports the disc 30 in a position to be easily graspedwhen it is desired to separate the disc from the roll 10. In FIG. 4 aplurality of discs 25 are shown which are joined along perforated linessubstantially tangent to the discs. The lines are not longer thanone-half the radius of the discs and maintain the discs 25 in aconcatenatious configuration with the discs joined at the lines or necks28. The length of the cutting edge 24 exposed by the registering means26 will generally be about the same width as the width of the necks 28between the discs 25 thereby insuring that successive discs will besevered at the neck. The registering means 26 will align the neck 28 inproper index with the cutting edge 24 and also retain the neck in theproper position as the disc being dispensed is separated from the roll.The registering means, by holding the neck at the proper place forseparation, allows separation of the discs using only one hand, therebeing no need to manually hold the roll or the disc with the neck inposition to be severed. This is in contrast to prior art devices whereno means are provided for holding the neck in the proper position andthe discs must be manually indexed thereby requiring the use of twohands.

The dispenser of this invention is useful for dispensing a variety ofitems which can be produced in roll form. The items to be dispensed canbe of irregular shape, the rear portion of one item being joined to thefront portion of the succeeding item, the individual items having aneck, which is substantially narrower than the width of the remainder ofthe item in order to provide an area for indexing the item to be severedwith relationship to the severing edge.

The abrasive discs of this invention can be formed from a wide varietyof well-known coated abrasive products such as cloth, or paper-backedcoated abrasives. The coated abrasive products used will have a flexiblebacking material which allows the abrasive to be convolutely rolled intoa roll of abrasive disc segments.

Pressure-sensitive adhesives useful for coating disc are known in theart. Examples of such adhesives being vinyl ethers, acrylates, andrubber resin disclosed in US. Pat. Nos. Re. 24,906; 2,485,295; etc. Thepresently preferred adhesives, because of their extended shelf life andresistance to detackifying under atmospheric conditions, are acryliccopolymer adhesives disclosed in US. Pat. No. Re 24906. One example ofsuch an acrylic copolymer is a 95.5245 isooctylacrylatezacrylic acidcopolymer. Such a copolymer can be coated on the back of a concatenateof coated abrasive disc segments as a solution in heptane: isopropanolsolvent and the heptane: isopropanol solvent evaporated leaving apressure-sensitive adhesive having an extended life.

Various modifications and alterations of this invention may becomeobvious to those skilled in the art; it is to be understood, however,that the scope of this invention is not to be limited to the specificillustrative examples or materials described herein but includes thosechanges coming within the scope of the appended claims.

What is claimed is:

1. A device for dispensing individual items from a concatenated roll ofjoined items comprising:

supporting means for rotatably supporting a concatenated roll of joineditems having necked portions substantially narrower than the width ofthe remainder of the item, said supporting means including a shafthaving a length to extend through a roll of items and support said roll;

a frame in which said supporting means is mounted;

a standard formed on said frame opposite to and spaced from saidsupporting means, said standard having disposed thereon asmooth-surfaced retention member to support the free end of said roll;

a severing edge on said standard located adjacent the edge of saidsmooth-surfaced member opposite said support means; and

registering members on said standard and located adjacent each end ofthe severing edge, said registering members projecting above andtransversely to the severing edge to limit the length of said severingedge for engaging an item adjacent the necked portions and restrictingthe dispensing of items during severing and insuring that each item willbe indexed so that the item being dispensed will be severed from theadjoining item at the necked portion between successive items.

2. A device for individually dispensing coated abrasive discs from aconcatenated roll of pressuresensitive coated abrasive discs comprising:

supporting means for rotatably supporting a convolutely woundconcatenated roll of coated abrasive discs;

a frame in which said supporting means is mounted;

a standard formed on said frame and spaced from said supporting means,

a smooth-surface retention member on said standard and projectingtherefrom toward said supporting means to which the free end of saidroll can adhere by reason of the pressure-sensitive adhesive coat on thediscs;

a cutting blade on said standard and located adjacent an edge of saidsmooth-surfaced retention member opposite said supporting means; and

registering members on said standard located adjacent each end of saidcutting blade and projecting above and transversely of said cuttingblade and retention member and terminating in smoothly rounded free endsdefining an opening leading to the cutting blade for limiting the lengthof said blade and for engaging the discs on the roll to restrict furtherunwinding dun'ng severing of one disc from the roll thereby insuringthat each disc will be severed from the roll at its line of tangeneywith the adjoining disc.

1. A device for dispensing individual items from a concatenated roll ofjoined items comprising: supporting means for rotatably supporting aconcatenated roll of joined items having necked portions substantiallynarrower than the width of the remainder of the item, said supportingmeans including a shaft having a length to extend through a roll ofitems and support said roll; a frame in which said supporting means ismounted; a standard formed on said frame opposite to and spaced fromsaid supporting means, said standard having disposed thereon asmooth-surfaced retention member to support the free end of said roll; asevering edge on said standard located adjacent the edge of saidsmooth-surfaced member opposite said support means; and registeringmembers on said standard and located adjacent each end of the severingedge, said registering members projecting above and transversely to thesevering edge to limit the length of said severing edge for engaging anitem adjacent the necked portions and restricting the dispensing ofitems during severing and insuring that each item will be indexed sothat the item being dispensed will be severed from the adjoining item atthe necked portion between successive items.
 2. A device forindividually dispensing coated abrasive discs from a concatenated rollof pressure-sensitive coated abrasive discs comprising: supporting meansfor rotatably supporting a convolutely wound concatenated roll of coatedabrasive discs; a frame in which said supporting means is mounted; astandard formed on said frame and spaced from said supporting means, asmooth-surface retention member on said standard and projectingtherefrom toward said supporting means to which the free end of saidroll can adhere by reason of the pressure-sensitive adhesive coat on thediscs; a cutting blade on said standard and located adjacent an edge ofsaid smooth-surfaced retention member opposite said supporting means;and registering members on said standard located adjacent each end ofsaid cutting blade and projecting above and transversely of said cuttingblade and retention member and terminating in smoothly rounded free endsdefining an opening leading to the cutting blade for limiting the lengthof said blade and for engaging the discs on the roll to restrict furtherunwinding during severing of one disc from the roll thereby insuringthat each disc will be severed from the roll at its line of tangencywith the adjoining disc.